fix blocksruntime wasm build

thirdparty/blocksruntime/BlocksRuntime/runtime.c

@@ -23,10 +23,23 @@
  */
 
 #include "Block_private.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+
+#ifdef PLATFORM_WASM
+   void* malloc(unsigned long s);
+   void free(void* ptr);
+   int printf_(const char*, ...);
+   #define printf printf_
+   int sprintf(char* restrict, const char* restrict, ...);
+   #define memmove(a, b, c) __builtin_memmove(a, b, c)
+   #define exit(a) do { if (a != 0) { __builtin_trap(); } } while (0)
+#else
+   #include <stdio.h>
+   #include <stdlib.h>
+   #include <string.h>
+#endif
+
 #include <stdint.h>
+#include <stddef.h>
 
 #include "config.h"
 
@@ -697,4 +710,3 @@ const char *_Block_byref_dump(struct Block_byref *src) {
     }
     return buffer;
 }
-